Category Archives: Operating System

Operating system is computer/device software used to organize how the computer work, mainly as base software that build up and connect all the computer hardware with ability to maintenance and organize how other application work.

in previous post ive install kodi on raspberry pi2.
installation was successfull and i can see kodi start screen on my tv. but what about its feature to play any videos (almost format) and music files?

the next step is to try some movie files with different display size, from sd to hd.
all SD file size was played smoothly by kodi. but for 1080p size first i saw lag on video.
to solve this lag problem it is suggested that we change gpu parameter in /boot/config.txt to be larger than 160. just to make sure it is larger than 160 i set it to 512 haha don’t know whether it was necessary or not. alongside with increasing gpu mem i also try menu raspi-config to do the overclocking.

now the bottom of my /boot/config.txt looks like this

arm_freq=900

gpu_mem=512
core_freq=250
sdram_freq=450
over_voltage=2

i did the reboot and tried to play the 1080p video file and other video file. Viola there was no lag. But some of the videos didn’t output sound. There was just no output sound.
i tought maybe it was codec problem. so i move to next step. Testing video add-on. and yes, the same problem appeared, all add-on video (display) was playing well, but there was no sound :(. i’ve tried several add-ons such as youtube, 9gag.tv, and ted talk.

after some googling i found some posts suggest us to set some options in kodi setting > system > audio output. you can try by yourself. i found my issue was solved by doing this..

Step 1. Testing analogue output

1. setting > system > audio output2. plug your headset/earphone (3.5 mm jack) to your raspberry pi 2
3. back to kodi menu, choose audio output device, change from default PI:HDMI to other output device >> PI:analogue. Don’t forget to adjust kodi volume with your remote :D. set the volume up to make sure it was not reset to minimum volume.
4. the sound shoud’ve came up by now :). now you can listen with your earphone all the time, or output it to speaker (using 3.5 mm jack).

Now what you want is offcourse sound output on you tv (via hdmi).

1. now choose “Audion Output Device” back to original >> PI:HDMI.
2. see if the sound appear, if not now check the “Output Configuration” menu.
3. Change from default “Best Match” to “Fixed”. Check “Limit sampling rate” the default value is “48.0”.
4. “This is”, Now my video that previously didn’t output sound on HDMI audio ouput begin to sound :D. if it still not ouput anything try to change default value “48.0” with other value available in the menu. see if one gives you what you want. dont forget check the kodi volume (via remote) each time you try your configuration.

After installing raspberry pi on my microSD card, i found that my micro SD is not fast enough. if you want to do the test you can go here.

I had to replace my micro SD with another micro SD with bigger capaticy and faster write/read speed. however when i try to re format my micro SD (use it in my android phone). it is displayed that my micro SD size is only 56 Mb, while its capacity is actually 16GB. Where the rest of capacity?

SQL exception The last packet successfully received from the server was 37,662,089 milliseconds ago. The last packet sent successfully to the server was 37,662,143 milliseconds ago. is longer than the server configured value of ‘wait_timeout’.

on some applications, everytime this exception occured the process is stopped and the transaction is failed.
asking some of my friend who have faced this kind of error before, they recommended to update connector library, they told me that their problem were gone after they did it. but unfortunately it didn’t work for me. so i had to do some googling, and found this one

http://stackoverflow.com/questions/6865538/solving-a-communications-link-failure-with-jdbc-and-mysql
Solving a “communications link failure” with JDBC and MySQL

in the post itself the writer wrote that there are some solutions that may work, while other may not work for the same SQL Exception message.

for me so far the solution is to use these property

validationQuery property

AutoReconnect

add this line to our dcbj configuration in context.xml
validationQuery=”SELECT 1″ testOnBorrow=”true”

So it happened yesterday, when i buy new laptop HP Probook 4441s, Unfortunately the online store where i bought this laptop didn’t put in driver software. i had a hard time finding out what software to install to enable my wireless card.

I tried with my laptop hardware specification, but since its sold in some model, i couldnt get any accurate information about the wireless card. actually HP has stored many driver software but, trying it one by one would just waste my time. I better find out it make and model of any hardware in my laptop, then begin searching the right package of driver software to install.

not like ubuntu, i couldnt find any simple step to find out the make and model of unknown device. so i came to google with keyword
how to find wireless card in windows
how to find wireless card chipset in windows
how to see wireless card information in windows,
e.t.c
untill i find really good sites which offers me simple solution with software
the software named unknown device identifier worked really well, in just one click, you can get a resume for any of your hardware attached in your windows laptop

you can go to the page below and download from the source, hope it can help you solve your problem

List of PC tablet with docking. Below i write a list of PC Hybrid or PC Tablet Laptop with Docking Station. Other options to attach keyboard to our table exist, such as (non-original) keyboard docking for android and keyboard docking for ipad. But these devices i write below has its original keyboard docking and offers us experience of tablet PC and laptop at the same time.

2. Microsoft Surface
Microsoft surface is revolutionary new tablet by Microsoft, The Surface comes in two versions: one with Windows RT and another with Windows 8 Pro. The Windows RT model uses an ARMCPU, while the Windows 8 Pro model uses an Intel CPU.

Issue with microsoft surface comes with its storage capacity. Its Operating system and applications will need around 32 GB of storage. Leaving amount of harddisk space – 32GB to be used as real storage for files.

5. Lenovo IdeaPad
Lenovo comes up with variety of PC Tablet Product, IdeaPad Yoga is one of its product that offers you 4 mode. Like it said in it website, “Choose from one of four modes to use your Yoga: tablet, laptop, tent or stand. Simply flip and fold
the touchscreen, then start your journey.”

Lenovo IdeaPad Yoga

Yoga 11 with 11.6″ HD display and Yoga 13 with 13.3″ HD IPS Display.
Those two products is actually called convertible laptop, its keyboards can move almost freely in 360 one axis movement.

Host file in windows is used to map ip address into the its name. By using hosts file we can refers any particular IP address by using the name we specified.

the hosts file contains lines of ip address and its name for example

127.0.0.1 localhost

so every time we use ‘localhost’ in any networking activities in our laptop, this will be translated into 127.0.0.1, which is our loopback ip address, ip address belongs to our own laptop/pc/device.

How to edit hosts file
editing host file in windows is as simple as adding new lines containing ip address, space, and name we want to refer.

for example i want to add ip address 167.205.1.34 which i want it be referred by college.
just add it below the existing line

127.0.0.1 localhost
167.205.1.34 collage
10.2.30.5 office

the steps :

1. the hosts file is located in C:/Windows/System32/Drivers/etc/
it is file with no extension

2. To open this file, you will need administrator privilege, so you need to open it using any word processor that has administrator privilege confirmed.
for example we can use notepad, but when we want to run notepad,
first, do the right click on notepad icon, then choose ‘run as administrator’, choose yes when dialogue appear

3. in menubar choose File > Open, look for C:\Windows\System32\drivers\etc
if you don’t see any file, make sure you choose *All File in file type option

How to edit hosts file in Windows 7

4. You will find the hosts file, choose it, and open. Add the ip address and name you want and save those notepad using Ctrl+S.

Blocking web address using host file

Other simple use of Hosts file in windows and other operating system is to block web address. This can be done by pointing any web address which is inn their domain name, to our local ip address. for example, we want to block google.com and facebook.com. Then just add in our hosts file

127.0.0.1 google.com
127.0.0.1 facebook.com

it will point google.com to 127.0.0.1, our own ip address. so it will not reach the real google.com and display nothing in the web browser

have you experienced a moment when you use command prompt and it feels not comfortable? if yes, then the answer is maybe because by default we can not do copy paste in windows command prompt. To enable Copy and Paste function in CMD, we just need 3 step.

How to see your windows product key?. How to see your windows 7 serial number? Windows product code once installed, this information will be saved by windows in registry, there is no common utilities provided by windows to look or to view this product key or serial number. However if you want to see this windows product key or you want to see your windows serial number. there are many free programs available to download.

one of those program is belarc advisor.
Using this belarc advisor you can get more information that you need. Belarc Advisor will not only provide you your windows (windows 7, vista, xp) product key/serial number. It will also give you any product key from application program that you have installed into your PC.

It gives you more for less expectation, in fact, it will display our computer profile summary, haha its scary actually because it can reveal our sensitive data such as our windows security update status, any used application in some past days, and any media storage that we had plugged in into our computer

This is How Belarc Advisor shows me my windows 7 product key

How to see your windows product key

It may take several minutes for belarc advisor to get all of this data, but it is very informative and very easy to use :).

If you want to see your windows 7 product code / serial code, just Download it here